package com.why.config;

import com.why.interceptor.LoginCheckInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.annotation.Resource;
import java.util.List;

@Configuration //配置类
public class WebConfig implements WebMvcConfigurer {

    @Resource
    private LoginCheckInterceptor loginCheckInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 注册拦截器
        registry.addInterceptor(loginCheckInterceptor)
                .addPathPatterns("/**")
                .excludePathPatterns("/teacher/login/**")
                .excludePathPatterns("/teacher/register");
    }

    /**
     * 扩展MVC框架的消息转换器
     * @param converters
     */
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        // 创建消息转换器对象
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        // 设置对象转换器，底层使用Jackson将Java转为Json
        messageConverter.setObjectMapper(new JacksonObjectMapper());
        // 将上面的消息转换器对象追加到MVC框架的转换器集合中
        converters.add(0,messageConverter);
    }
}
